I was just looking for a similar thing and found this (Perhapy it helps):
2004-09-13 Kay Sievers <kay.sievers@vrfy.org>
* hald/linux/multimedia_class_device.c:
(multimedia_class_device_accept), (multimedia_class_pre_process):
New file for initial support of video4linux devices. It's just
a starting point and we need more input from users of v4l
devices. For a simple webcam it currently looks like this:
multimedia.device = '/udev/video0' (string)
info.category = 'multimedia' (string)
multimedia.video.can_capture = true (bool)
multimedia.audio.has_audio = false (bool)
multimedia.tuner.has_tuner = false (bool)
multimedia.linux.version = 'v4l' (string)
info.udi =
'/org/freedesktop/Hal/devices/usb_device_5a9_a511_100_-1_noserial' (string)
* hald/linux/osspec.c: Add the new multimedia_class_handler to
probe for video device properties on device discovery
* tools/device-manager/Representation.py: Change "video" to
"multimedia" to have a nice icon for the screenshots :)